In re Hollingsworth

This is an appeal from the decision of the Board of Appeals of the United States Patent Office affirming the final rejection by the Primary Examiner of claims 1, 10, 11, and 12 of appellants’ application for a patent on a method of defluorinating phosphate rock, on the ground of unpatentability over prior patents. No claims were allowed.

Claim 1, typical of the appealed claims, and upon which the other claims are dependent, reads:

1. The method of defluorinating phosphate rock which comprises subjecting the rock with a silica content not exceeding 6% to calcination at a temperature of at least…